Ground State Property of a One-Dimensional Bose–Hubbard Model Using Time-Evolving Body Decimation
OUYANG Sheng-De1**, LIU Jing2, XIANG Shao-Hua1, SONG Ke-Hui1**
1Department of Physics and Information Engineering, Huaihua University, Huaihua 418000 2Department of Education Science, Huaihua University, Huaihua 418000
Abstract：We study the ground state property of the one-dimensional Bose–Hubbard model using an imaginary time evolving body decimation algorithm. The single-particle density matrix is numerically calculated for a Mott insulating system and a superfluid system separately. By plotting the chemical potential versus the filling n=N/L for U/J=20 and U/J=0.1, we identify the Mott gap for U/J=20 in filling n=1. Lastly, we investigate the occupation number of the Bloch state with quasimomentum for a system deep in the Mott phase and in the superfluid phase respectively. The results indicate Bose condensation in the quasimomentum space.
(Static properties of condensates; thermodynamical, statistical, and structural properties)
引用本文:
. [J]. 中国物理快报, 2013, 30(8): 86701-086701.
OUYANG Sheng-De, LIU Jing, XIANG Shao-Hua, SONG Ke-Hui. Ground State Property of a One-Dimensional Bose–Hubbard Model Using Time-Evolving Body Decimation. Chin. Phys. Lett., 2013, 30(8): 86701-086701.
2013, Vol. 30 
